code: def test_to_csv_interval_index(self, using_infer_string):
      # GH 28210
      s = Series(["foo", "bar", "baz"], index=pd.interval_range(0, 3))
  
      with tm.ensure_clean("__tmp_to_csv_interval_index__.csv") as path:
          s.to_csv(path, header=False)
          result = self.read_csv(path, index_col=0)
  
      # can't roundtrip intervalindex via read_csv so check string repr (GH 23595)
      expected = s
      if using_infer_string:
          expected.index = expected.index.astype(
              "string[pyarrow_numpy]"
          )
      else:
          expected.index = expected.index.astype(str)
      tm.assert_series_equal(result, expected)
  
file_path: pandas/pandas/tests/series/methods/test_to_csv.py
imports: from datetime import datetime
  from io import StringIO
  import numpy
  import pytest
  import pandas
  from pandas import Series
  import pandas._testing
  from pandas.io.common import get_handle
label_desc: Use image node_id 9 for calling the TestSeriesToCSV obj's underlying member method code with example usage: obj.test_to_csv_interval_index(using_infer_string) without return types